Improvement in boring-machines



TATES IMPROVEMENT IN BORING-MACHINES.

" Specification forming part of Letters Patent No. 122,402, datedJanuary 2;1872.

To all whom it may concern! I Be it known that I, ZACARIAH C. PHILLIPS,0f the'city and county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in BoringMachines and I 'do herebydeclare that the following isa full, clear, and exact descriptionthereoi', reference being had to the accompanying drawing and to theletters of reference marked thereon.

The nature of my invention consists in a hol- Vlow mandrel provided withan adjustable oompound crank, a gauge, and screw-threads, and fittedinto a pivoted and adjustable bearing, provided with a trigger whichcauses the mandrel and its augerto become inoperative by the gaugecoming in Contact with the trigger, the whole being adapted toWood-boring augers and bits7 To enable others skilled in the art to makeand use my invention, I will proceed to describe more fully itsconstruction and operation.

In the accompanying drawing which forms part of my specilication, Figurerl is a side elevation of my improvement in boring-machine. Fig. 2 is averticall section at line y of Fig. 1, and represents the manner ofpivoting the bearing to the frame and seat for the operator. Fig. 3 isan enlarged View, in section7 ofthe mandrel bearing and its trigger.

Inthe accompanying drawing, A represents the frameor seat for theoperator. B represents two curved and slotted arms,vwhich are used forthe purpose of holding the bearing C the upper end ofthe mandrel D isattached a compound crank, consisting of handles n o and levers p r s t,which levers may be adjustedthrough the medium of set-screws a, andlengthened, as indicated, by the dotted lines w. The desired angle isgiven to the bearing C and mandrel D through the medium ofthe slots o inthe curved arms B andthe set-screws x. The auger is held in position inthe mandrel D by a pin or setscrew.' The frame A is constructed of wood,and the bea-ring C, mandrel D, trigger-collar, and arms B of suitablemetal.

- The operation of my improved boring-machine is as follows Having theparts adjusted and arranged as shown in Figs. l and 2, the operator turns or revolves the mandrel D, which will revolve the auger, and the screwon the end of it will give it the necessary feed. The depth of theboring being gauged by the collar l, as soon as it comes in contact withthe point l of the part f. of the trigger the point 2 will be thrown upand the point 3 of part e will be thrown into `the space between thescrewthreads 7c by spring h, and thereby cause the mandrel `D and augerattachedto it to travel upward. The parts are then reset for boring asecond hole.

Having thus described the construction and operation of my improvedboring-machine, what I claim as being of my invention, isrIhe pivotedbearing G provided with atrigger, as shown, and used in combination withthe collar] and hollow mandrel Dprovided with a compound crank, allconstructed and operating substantially as herein described, and for thepurpose set forth.

y Z. C. PHILLIPS.

Witnesses:

JAMES J. J oHNs'roN, JN0. D. PATTEN. (173)

